True-false questions are worth 2 points each, three-choice multiple choice questions are worth 3 points each, five-choice multiple choice questions are worth 6 points each. The maximum possible score is 108. The exam period was 90 minutes; the mean score was 76.3; the median score was 78. Click here to see page1 page2 page3 of the formula sheet that came with the exam.

Your car is stopped at the edge of a 14 m wide road. Your car can accelerate at 3.5 m/s^{2}.

What is the shortest time for your car to cross the 14 m wide road?

(a) 1.0 s (b) 2.8 s (c) 9.8 s

(a) 3.6 m/s^{2} (b) 9 m/s^{2} (c) 9.8 m/s^{2}

A box of mass m_{box} = 1 kg sits on a wheeled cart of mass m_{cart} = 14 kg. The wheels roll freely (without friction). The coefficient of static friction between the box and the cart is μ_{s} = 0.4. You begin to push the cart horizontally.

What is the magnitude of the maximum static friction force on the box?

(a) 0.4 m_{box} g (b) 0.4 m_{cart} g (c) 0.4 (m_{cart} + m_{box}) g

(a) 147 N (b) 58.8 N (c) 40.0 N (d) 19.6 N (e) 3.14 N

(a) a_{box} = 0 (b) a_{box} = F / m_{box} (c) a_{box} = F / (m_{box} + m_{cart})

I shot an arrow in the air. The initial speed is 50 m/s, and the arrow is oriented at 45° to the horizontal. Neglect air resistance and assume the arrow started at the same height as the ground.

What is the arrow's vertical (y) acceleration just before it hits the ground?

(a) +9.8 m/s^{2} (b) 0 m/s^{2} (c) -9.8 m/s^{2}

(a) 30 m/s (b) 40 m/s (c) 50 m/s

(a) 144 m (b) 201 m (c) 255 m (d) 301 m (e) 355 m

(a) L / 4 (b) L / sqrt(2) (c) 2 L

(a) 0.01 m/s^{2} (b) 0.11 m/s^{2} (c) 1.1 m/s^{2} (d) 9.8 m/s^{2} (e) It is impossible to tell from the information given.

Three weights of mass M are hung from the ceiling using three ropes. The top on is hung directly from the ceiling, the second is hung below the first one, and the third one is hung below the second one.

Which one of the following is true?

(a) The tension in the top rope is the same as that in the bottom rope. (b) The tension in the top rope is less than that in the bottom rope. (c) The tension in the top rope is more than that in the bottom rope.

(a) 1.33 (b) 1.5 (c) 2

(a) F_{N} < mg (b) F_{N} = mg (c) F_{N} > mg

(a) 1 m/s (b) 5 m/s (c) 5.1 m/s (d) 6 m/s (e) 6.1 m/s

There is an ocean current of 7m/s from west to east. A cruise ship can move at the speed of 18 m/s relative to the water.

What is the speed v of the cruiser relative to the water in knots (1 knot = 1.852 km/hr)?

(a) v = 10 knots (b) v = 15 knots (c) v = 25 knots (d) v = 35 knots (e) v = 50 knots

(a) θ = 17° (b) θ = 19° (c) θ = 21° (d) θ = 23° (e) θ = 25°

A block of mass 15 kg sits in on a horizontal surface. The coefficient of kinetic friction between the block and the surface is μ_{k}. The x component of its velocity (which is parallel to the surface) is graphed below.

The position (x coordinate) of the block is graphed versus time. Which of the three graphs below is the correct one?

(a) (b) (c)

(a) | a_{x} | = 2.0 m/s^{2} (b) | a_{x} | = 3.0 m/s^{2} (c) | a_{x} | = 4.0 m/s^{2} (d) | a_{x} | = 5.0 m/s^{2} (e) | a_{x} | = 6.0 m/s^{2}

(a) μ_{k} = 0.13 (b) μ_{k} = 0.29 (c) μ_{k} = 0.58 (d) μ_{k} = 2.9 (e) μ_{k} = 5.8

A 70 kg person steps onto an elevator with a 10 kg dumbbell. While riding in the elevator, the person notices that the dumbbell actually weighs 11 kg on a scale.

What do you know about the direction the elevator is moving (its velocity)?

(a) up (b) down (c) not enough information

(a) F = 530 N (b) F = 690 N (c) F = 739 N (d) F = 755 N (e) F = 815 N

(a) | a | = 1.0 m/s^{2} (b) | a | = 2.0 m/s^{2} (c) | a | = 4.0 m/s^{2} (d) | a | = 9.8 m/s^{2} (e) | a | = 10.8 m/s^{2}

There is an incline and a block of mass 20 kg on it as shown in the figure. The angle of the slope is 40°.

When the horizontal force F whose magnitude is 360 N is applied as shown in the figure, the block stays stationary on the slope. What is the magnitude of the normal force acting on the block from the slope?

(a) 150 N (b) 231 N (c) 250 N (d) 331 N (e) 382 N

(a) 7.5 m/s^{2} (b) 8.6 m/s^{2} (c) 9.7 m/s^{2} (d) 10.8 m/s^{2} (e) 11.9 m/s^{2}